db.getCollection("Examtype").insert( {
    _id: ObjectId("610ba25b1c78644a18938a51"),
    examType: "正式考试"
} );
db.getCollection("Examtype").insert( {
    _id: ObjectId("610ba2631c78644a18938a54"),
    examType: "模拟考试"
} );
db.getCollection("Examtype").insert( {
    _id: ObjectId("610ba26c1c78644a18938a57"),
    examType: "每日一测"
} );
db.getCollection("Examtype").insert( {
    _id: ObjectId("610ba2771c78644a18938a5a"),
    examType: "顺序练习"
} );
db.getCollection("Examtype").insert( {
    _id: ObjectId("610ba27c1c78644a18938a5d"),
    examType: "分类练习"
} );
